From: Hiroshi Nakamura <nakahiro@...>
Date: 2011-04-14T13:51:38+09:00
Subject: [ruby-core:35749] Re: mvm branch status?

Hi,

On Wed, Apr 13, 2011 at 06:56, Charles Oliver Nutter
<headius@headius.com> wrote:
> On Sun, Apr 10, 2011 at 11:28 PM, Urabe Shyouhei <shyouhei@ruby-lang.org> wrote:
>> What C APIs are safe to use with MVM is not fully certain yet. �For instance
>> there are process-global states other than C global variables like current
>> directory, signal masks, ... We are still exploring.
>
> For current directory, JRuby maintains that separately and any calls
> that are sensitive to cwd are modified to use this per-runtime value.
> Because we share the JVM, we can't safely chdir the entire process, so
> this was really the only way.

Shyouhei's branch works as the same.
% ./ruby-mvm -e 'p Dir.pwd; 2.times { RubyVM.new("ruby", "-e",
"Dir.chdir %q(.ext); p Dir.pwd").start }; sleep 1'
"/home/nahi/git/shyouhei-ruby/build"
"/home/nahi/git/shyouhei-ruby/build/.ext"
"/home/nahi/git/shyouhei-ruby/build/.ext"

https://github.com/shyouhei/ruby/tree/shyouhei%2Fmvm-topicalization

Shyouhei's branch introduced per VM initialization (InitVM_*) and some
ext/* extensions changed to use it. The remaining issue is that there
should be more exts which depends on C's static thing. libssl has
global error stack so ext/openssl must handle this... Is it worth
trying?

Regards,
// NaHi